i have a major leak under the crawl space of an addition on the house. before i start patching, i have serious doubts ANY of the home plumbing meets code. the source lines look like galvanized piping, within about 2 feet after the hot water heater, they switch to QEST-E-PB2110 3P tubing. its only 100psi, and 1/2" diameter (going up 2 floors). Also, a section of the galvanized intake pipe was patched at some point with 1/2" PVC. The numerous patches and materials in themselves make me think a total re-piping is in order, but I rent here, so, that's not going to happen. I can add more splices and patches to the mess, but if it doesn't meet code to start with, I'll pass the problem off to the landlord and a real plumber. oh! this is in Maryland, guess that would be important for code questions! thanks